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Hi,
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I know electrical problems are probably the most frustrating things to go wrong. First I would like you to get your alternator and auxillary power generator checked. Autozone and similar can scan it. My alternator had us doing 55mph at a stop and running up miles too!

The generator can put out "dirty" power that is incompatible with delicate electronics.

There may be a speed sensor in the differential. I know some have them there. If not, I am sorry to say your computer may be bad. There are aftermarket devices for adjusting the speedometer for different size wheels and tires. This is done with computer reprogramming. Your vehicle should not have lost its settings on its own. If something is interferring with the readings it is possible to remove that device and your computer may recover.

Your leveler alert horn may be out of adjustment. Test the leads of horn before scrapping it. It may still honk.

If you recently plugged into a trailer park before this came about, you should have some warning panel to test crossed wires. If this is electrical damage due to casualty you may have homeowners coverage. Good Luck

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Related Questions:

You may have a short to ground from your battery. I had a battery fall out of the holder and the positive post grounded out and caused the horn to blow. I though it was haunted until I discovered the problem. It had back fed positive voltage thru the ground to the horn.

Hi DennisGet the cylinder head checked and ensure there are no water leaks around the water pump, heads are expensive for these cars, also check the clutch make sure there is no wobble from the gear stick if manual.and go through the gears while driving up and down them make sure there is no crunching coming down the gears. and check the heating system works.

Hi dont know alot about it but I would change out the horn relay.That is under the dash on the pass. side up high and behined the glove box 2 nuts to take out and it should drop down hard to get at too.